convert tabs to spaces
fix blur for RGBA & RGBX
add detailed test for blur and simple test for sharp
round pixel values
cache hasAlpha for ImagingUnsharpMask
Merge branch 'fix-blur-alpha'
reference gaussian_blur implementation
radius meaning match graphicmagick, pixelmator other software
  and standard deviation from classic gaussian blur algorithm
padding not using anywhere
remove pseudo vcs
rename vars
add effective_scale to all APIs
fix tests and set default effective_scale value for gaussian filter
fix radius == 0
do sum calculation in same loop as maskData calculation
round values with initial .5
this improves performance and readabillity
unused
Merge branch 'gaussian-refactor' into fast-box-blur
replace gaussian blur with extended box blur implementation
change test due to different behavior on small radius
change arguments order and names to match other functions